Dual display device



FIG. 1 is a front perspective view of a dual display device showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top side view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right view thereof; and,

FIG. 6 is a left view thereof.

The broken line showings of the dual display device are for environmental purposes and form no part of the claimed design. 

The ornamental design for a dual display device, as shown and described. 